A medium-voltage electric heating control method, system and equipment

Abstract

This invention discloses a medium-voltage electric heating control method, system, and device, relating to the field of industrial electric heating control technology. The invention receives set parameters through a human-machine interface module, collects three-phase power supply current and voltage signals, and the real-time temperature of the heating load. It then executes closed-loop power regulation according to a selected phase or cycle control mode. In phase control mode, theoretical power is calculated based on a self-developed analytical solution formula for the differential equation of the power system. Power feedforward compensation is performed using a custom load resistance-temperature mapping function R(T). A coupling relationship is established through a derived power derivative formula. The physical feasible domain Ω(T) of the trigger angle is dynamically generated based on the current change rate constraint formula, and a thyristor trigger pulse is generated after correction. During full-voltage output, bypass operation is switched, and a six-fold protection mechanism is implemented. This invention addresses issues such as numerous device safety hazards, difficulty in balancing harmonics and control accuracy, and insufficient accuracy in multi-device coordination by embedding a formula-based physical constraint system into the control core.

Images